Roughly how many carbs before weight training?

I'm roughly 90kg, 6'2" and body fat is estimated around 16%, maybe more.
 
Currently I've been eating breakfast which contains 40g of oats, 40g of blueberries and one scoop of ON whey, couple hours afterwards one medium sweet potato with a protein source, usually chicken or tuna. I'll then train, then have my post workout shake with 25g of raisins then an hour or so later my post workout meal which is 60g rice, usually chicken or tilapia with vegetables.
 
Now this has been working well, especially as I'm on a cut as I have enough energy for weights and cardio, with my sessions roughly lasting an hour and a half. 
 
The only problem I have is it leaves me late for work, sometimes when I start at 3 I don't get in til 3 on the dot and it leaves me little time to prepare myself, so now I'm thinking of skipping my second meal which is the sweet potato and tuna/chicken and just having 80g oats with 80g strawberries&blueberries, one scoop of whey and then train an hour and a half later.
 
My question is, ideally- what would be the best amount of carbs to have for a person my size pre-workout?
 
I suppose one way would be to find out, but I just wanted to see if i i could get an answer before I trial and error this...
 
Experiences anyone?
 

I try to eat as little as possible before training <20% of totaly daily calories.
 
The reason I do this.

I treat my day before nutrition as my pre-workout nutrition, i find the more I eat the day before the better I perform.
I just need to eat enough before working out to keep my blood glucose up and for mental reasons.

But I prefer eating most of my calories post workout as I find it's more of a factor the day after for the next workout.
 
But right before a workout Perhaps have a decent meal 2-3 hour pre-workout just a normal sized meal not too much fat or fibre (don't want it sitting in your stomach working out) and maybe just before your workout have 20-30g carbs in liquid form.
 
Was recommended for me, I never drink my cals, but it does certainly give a nice performance boost taking liquid cals right before the workout.